双月刊

ISSN 1006-9895

CN 11-1768/O4

1979-2020年北极和青藏高原臭氧低值区的动力输送特征比较
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作者单位:

1.南京信息工程大学 大气科学学院;2.中国地质大学(武汉) 环境学院大气科学系;3.南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心;4.南京信息工程大学 雷丁学院

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国家自然科学基金(91837311)


Comparison of dynamical transport’s characteristics in low ozone regions over the Arctic and the Tibetan Plateau from 1979 to 2020
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Affiliation:

1.Department of Atmospheric Science, School of Environmental Studies, China University of Geosciences;2.School of Atmospheric Sciences, Nanjing University of Information Science & Technology;3.Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology;4.Reading Academy, Nanjing University of Information Science & Technology

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    摘要:

    摘要 基于ERA5月平均再分析资料,利用Lorenz环流分解方法从定常和瞬变以及基流和涡旋的角度对比了北极与青藏高原臭氧低值区的动力输送特征。结果表明:动力总输送在两地上平流层作用最强,均使其臭氧浓度降低,且定常输送均强于瞬变输送,纬向与经向输送的作用均大致相反。然而,动力输送在北极地区的作用强度远大于青藏高原地区。北极地区纬向输送使得平流层中上层臭氧浓度降低,平流层下层臭氧浓度升高,经向输送的作用与之相反且强度明显偏弱,二者均主要作用于上平流层。青藏高原地区纬向和经向输送除在上平流层均使得臭氧浓度降低外,二者作用大致相反且强度相当,输送大值区在垂直方向上存在双中心结构,分别位于上平流层与上对流层-下平流层(Upper Troposphere - Lower Stratosphere, UTLS)区。两地区纬向和经向输送的差异均主要由定常涡旋输送所造成。青藏高原地区定常与瞬变输送的强度差异没有北极地区大。此外,两地定常和瞬变输送中涡旋对臭氧纬向平均的输送均起到主要作用,体现出涡旋输送在两地臭氧浓度变化的动力输送过程中发挥着至关重要的作用。

    Abstract:

    Based on the monthly ERA5 reanalysis datasets, the study considers the mean flows and eddies in the stationary or transient transport by using the Lorenz circulation decomposition method. The purpose is to compare the dynamical transport characteristics of ozone over the Arctic and the Tibetan Plateau in detail. The results indicate that the effect of the dynamical transport is the strongest in the upper stratosphere of these two regions, which results in the reduction of ozone. Further analyses suggest that the effect of the stationary transport is stronger than that of the transient transport, and the zonal and meridional transports almost have the opposite effect. However, the intensity of dynamical transport over the Arctic is much greater than those over the Tibetan Plateau. The zonal transport over the Arctic results in the reduction of ozone in the upper and middle stratosphere and the increase of ozone in the lower stratosphere, while the effect of the meridional transport is opposite and much weaker. Both of them mainly function in the upper stratosphere. Over the Tibetan Plateau, the intensity of the zonal transport is the same as the intensity of the meridional transport. They almost have the opposite effect except for the top of the stratosphere, where both of them lead to the reduction of ozone. There are two centers with the strongest transport over the Tibetan Plateau, located in the upper stratosphere and the upper troposphere - lower stratosphere (UTLS) respectively. The differences of zonal and meridional transports over these two regions are mainly caused by the stationary transport by eddies. The differences between stationary and transient transports over the Tibetan Plateau are smaller than those over the Arctic. Furthermore, the transport of zonal mean ozone by eddies plays a dominant role in the stationary and transient transport. Consequently, the eddy transport exerts an indispensable influence on the dynamical transport of ozone over the Arctic and the Tibetan Plateau.

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历史
  • 收稿日期:2021-08-22
  • 最后修改日期:2022-02-25
  • 录用日期:2022-03-23
  • 在线发布日期: 2022-04-11
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